Configuring a Virtual Template

Layer 2 protocols cannot directly carry each other. Before configuring PPPoE access, create a virtual template (VT).

Context

Layer 2 protocols, such as PPP can communicate only over a virtual access (VA) session. A VA session, however, cannot be manually created or configured. Instead, a VA session is automatically generated after PPPoE services are configured and PPPoE parameters are defined in a VT.

Based on parameters defined in a VT, a device can automatically create VA interfaces for Layer 2 communication.

PPP packets are encapsulated based on parameters defined in a VT. A VT defines NCP parameters, such as IP addresses and upper-layer application protocols.
A VA session transmits data between the local and remote ends based on parameters defined in a VT.

When a VT is used for PPPoE services, the link layer protocol can only be PPP, and the network layer protocol can only be IP.

Before deleting a VT, ensure that the VT is not in use and the VA session automatically generated upon VT creation has been deleted.

Procedure

Run system-view
The system view is displayed.
Run interface virtual-template virtual-template-number
A VT is created and its view is displayed, or the view of an existing VT is displayed.
Run ppp authentication-mode { auto | { pap | chap | mschapv1 | mschapv2 } ^* }
A PPP authentication mode is configured.
(Optional) Configure PPP negotiation parameters.
- Run ppp timer { negotiate seconds | retransmit retry-times } ^*
  A PPP negotiation timeout period and the maximum number of retransmissions allowed are configured.
- Run ppp delay-lcp-negotiation [ force ]
  Delayed LCP packet transmission is configured.
- Run ppp keepalive { interval interval-time | retransmit times | response-timeout response-timeout-time } ^* [ datacheck | no-datacheck ]
  A PPP detection interval and the maximum number of retransmissions allowed are configured.
- Run ppp keepalive adjustment { system-state | retransmit }
  Adjustment of the number of PPP detections is enabled.
- Run mtu mtu
  An MTU is configured in the VT.
- Run ppp mru mru
  An MRU is configured for PPP negotiation.
- Run pppoe-motm motm-value
  The device is configured to encapsulate clock synchronization information to the MOTM tag in a PPPoE active discovery message (PADM).
- Run quit
  Return to the system view.
- Run pppoe ppp-max-payload enable
  The device is enabled to negotiate the MRU in compliance with standard protocols.
Run commit
The configuration is committed.